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Hello...I've owned my iMAC for 5 years with no major issues. I run on Snow Leopard. Today i started my computer and weird things happened; I can't type (yes, I replaced the batteries in the keyboard), itunes automatically starts and went to purchased music and started to play, Dashboard pops on. Whats up with this...Turning the computer on and off did nothing. ???

Well it is not a virus as there are no Mac OS X viruses. Maybe malware. Have you installed any cleaning programs lately such as CleanMyMac, MacScan, MacDefender, MacKeeper etc? Next question any chance key/s are stuck on the keyboard or have you changed any System Preferences? Have you gone into Utilities > Disk utility and run Repair Permissions? if no joy then do the following:-

Pop in your system install disc and boot from that, go into Utilities > Disk Utility and run Repair Disk and see what is reported.

Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!